PSI - Issue 71

Oleg Plekhov et al. / Procedia Structural Integrity 71 (2025) 10–17

17

via the hole-drilling method (ASTM E837-13a) with PDV for direct measurement of pressure impulse parameters. A 3D mathematical model was integrated with experimental data to analyze LSP dynamics. PDV-based analysis revealed a nonlinear relationship between pressure impulse amplitude and laser power density, exposing limitations of classical models (e.g., Fabbro et al., 1990). Copper exhibited pressure amplitude saturation at high power densities (≥10 GW/cm²), attributed to secondary plasma generation at the water-air interface. For titanium, a 1D plasma expansion model overestimated amplitude, but the absence of saturation allowed its application across the entire power range. PDV measurements at 6 GW/cm² in titanium detected elastic waves with minimal plastic deformation, confirming the inadequacy of simplified models. These findings emphasize the need for real-time diagnostics to calibrate LSP parameters accurately. Incorporating experimental pressure impulse data into the numerical model ensured strong agreement between simulated and measured residual stress profiles, including complex-geometry specimens. The efficacy of LSP was validated through fatigue tests on titanium specimens with stress concentrators: optimal treatment zone selection increased fatigue life sevenfold compared to untreated samples. The results demonstrate that successful LSP implementation requires a combination of precise modeling, experimental impulse verification, and strategic treatment planning, particularly for critical components with geometric features. Acknowledgements The study was conducted in the framework of the government task, registration number of the theme 124020700047-3. References Wu, J., Zhao, J., Qiao, H., Liu, X., Zhang, Y. and Hu, T. 2018. Acoustic wave detection of laser shock peening, Opto-Electronic Advances, 1(9), 1 – 5. Wu, J., Zhao, J., Qiao.H, Hu, X. and Yang, Y. 2020. The new technologies developed from laser shock processing, Materials, 13(6). . Tang, L., Jia, W. and Hu, J. 2018) An enhanced rapid plasma nitriding by laser shock peening, Materials Letters, 231, 91 – 93. Abdulstaar, M., Mhaede, M., Wollmann, M. and Wagner L. 2014. Investigating the effects of bulk and surface severe plastic deformation on the fatigue, corrosion behaviour and corrosion fatigue of AA5083, Surface and Coatings Technology, 254, 244 – 251. Xie, L., Wen. Y., Zhan, K.,Wang, L., Jiang, C. and Ji, V. 2016. Characterization on surface mechanical properties of Ti-6Al-4V after shot peening, Journal of Alloys and Compounds, 666, 65 – 70. Mordyuk, B.N., Karasevskaya, O.P. and Prokopenko, G.I. 2013. Structurally induced enhancement in corrosion resistance of Zr-2.5%Nb alloy in saline solution by applying ultrasonic impact peening, Materials Science and Engineering: A, 559, 453 – 461. Feng, Y., Hu, S., Wang, D. and Cui, L. 2016. Formation of short crack and its effect on fatigue properties of ultrasonic peening treatment 355 steel, Materials and Design, 89, 507 – 515. Guo, W., Sun, R., Song, B., Zhu, Y., Li, F., Che, Z., Li, B., Guo, C., Liu, L. and Peng, P. 2018. Laser shock peening of laser additive manufactured Ti6Al4V titanium alloy, Surface and Coatings Technology, 349, 503 – 510. Zhelnin, M., Kostina, A., Iziumova, A., Vshivkov, A., Gachegova, E., Swaroop, S. and Plekhov O. 2023. Fatigue life investigation of notched TC4 specimens subjected to different patterns of laser shock peening, Frattura ed Integrita Strutturale, 17(65), 100 – 111. Vshivkov, A., Iziumova, A., Gachegova, E and Plekhov O. 2024. Structural and fatigue features of Ti64 alloy after different laser shock peening, Russian Physics Journal, 67(3), 287-295. Warren, A.W., Guo, Y.B. and Chen, S.C. 2008. Massive parallel laser shock peening: Simulation, analysis, and validation, International Journal of Fatigue, 30(1), 188 – 197. Kostina, A., Zhelnin, M., Vedernikova, A., Bartolomei, M. and Swaroop, S. 2024. Finite-element simulation of residual stresses induced by laser shock peening in TC4 samples structurally similar to a turbine blade, Frattura ed Integrita Strutturale, 18(67), 1 – 11. Sakhvadze G.H., Pugachev M.S. and Sakhvadze G.G. 2020. Effect lase shock processing texnology on the propagation of cracks in metal, Modern problems of machine theory, №9 , 62-65 Coratella, S., Sticchi, M., Toparli, M., Fitzpatrick, M., Kashaev, N. 2015. Application of the eigenstrain approach to predict the residual stress distribution in laser shock peened AA7050-T7451 samples, Surface and Coatings Technology, 273(1), 39 – 49. Johnson, G.R., Cook, W.H. 1985. Fracture characteristics of three metals subjected to various strains, strain rates, temperatures and pressures. Engineering Fracture Mechanics, 21(1), 31-48. DOI: 10.1016/0013-7944(85)90052-9 Fabbro R., Fournier J., Ballard P., Devaux D., Virmont J. 1990. Physical study of laser-produced plasma in confined geometry, J. Appl. Phys. V. 68., 775-784. Strand O. T.; Goosman D. R.; Martinez C.; Whitworth T. L.; Kuhlow W. W. 2006. Compact system for high-speed velocimetry using heterodyne techniques. Review of Scientific Instruments. 77 (8): 083108 – 083108 – 8.